Three things to know about weather for RVers and travelers Monday 21 August

  • RVer’s along the southern and central Texas Coast should prepare for tropical storm conditions late tonight and Tuesday. Fresh water flooding, wind gusts over 50 mph, minor storm surge, and a tornado or two will be the primary hazards.
  • Southeast California and the interior West will continue to feel the impacts from the remnants of Hilary today.
  • Dangerous heat is back into much of the Central U.S. Heat index values approach 120 deg F in Missouri.

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Starting Monday morning, 27 November, this site will be down for a major upgrade. will return no later than Wednesday 29 November — sooner if possible. When the site returns, WILMA, our NEW(!) integrated weather impacts product, will be available. The Paywall will also be implemented. RV Weather will continue to provide free access to essential, RV-relevant National Weather Service Warnings and Advisories, current weather, and weather safety information. While the main site is off-line, I will post a simple forecast to my email list and to RVWeather on Facebook.

From the RV Weather Summer Office in Colter Bay Wyoming:

These are the most significant weather impacts to RV travel over the next two to three days. I do not list every area of rain, showers, or breezy winds. (It would be exhausting for both of us!). Please check out the animations and graphics for a good depiction of the weather along your route.


— Much of WA; northern and western OR; northern ID: Moderate to heavy wildfire smoke today. Smoke should ease and partially dissipate by late this afternoon. Visibility occasionally reduced to less than 3 miles.

Eastern OR; almost all NV; east-central and southern CA: Flood Watches continue through late tonight. Additional rainfall from the remnants of tropical cyclone Hilary could reach 1-4 inches with locally higher amounts. I-5, I-8, I-10, I-15, I-40, I-80, I-84, US-50, US-93, US-95, US-395, CA-58 potentially impacted.

Central and southwest NV; much of southeast and southern CA deserts; Los Angeles County Mountains: FLOOD and FLASH FLOOD WARNINGS this morning. Widespread and dangerous flooding is occurring and will continue this morning. Up to 7 inches of rain have already fallen in some areas. I-5, I-8, I-10, I-15, I-40, US-50, US-93, US-95, US-101, US-395, CA-58 potentially impacted.

Much of NV: High Wind Warnings and Wind Advisories continue today. Wind gusts 45-60 mph. Highest winds will be on exposed terrain at higher elevations. I-15, I-80, US-50, US-93, US-95 potentially impacted.


Most of ID except northern and southeast portions of state: Flood Watches in effect through Tuesday evening. A combination of remnants from tropical cyclone Hilary along with active monsoon conditions could lead to flooding rains. Up to 3 inches of rain in some areas is possible today. I-84, I-90, US-95 potentially impacted.

Southwest UT: Flood Watches through this evening. A combination of remnants from tropical cyclone Hilary along with active monsoon conditions could lead to flooding rains. I15 potentially impacted.

Southwest MT; southern and southeast ID; western UT: High Wind Warnings and Advisories this afternoon and evening. Wind gusts 50-60 mph. Highest winds will be on exposed terrain at higher elevations. I-15, I-80, I-84, I-90 impacted.

Central and south-central MT; western WY; much of UT; AZ except eastern and southwest portions of state: Locally severe thunderstorms possible this afternoon. Strong to damaging wind gusts are the primary hazard. I-8, I-10, I-15, I-17, I-19, I-40, I-70, I-80, I-90 potentially impacted.

— Western and central WY; central and northern UT: Strong winds this afternoon. Gusts 30-45 mph. I-15, I-70, I-80 impacted.

— Central, northeast and east-central WY; northeast CO: Red Flag (fire danger) warnings this afternoon and evening. Wind gusts 30-50 mph. I-25, I-76, I-90 potentially impacted.

— Western WY and south-central MT: Strong winds Tuesday afternoon. Wind gusts 30-40 mph. I-90, US-26, US-191 impacted.

—UT along the I- corridor: Marginal risk of severe thunderstorms Tuesday. Strong winds and a brief tornado or two are possible. I-15, I-70, I-80 potentially impacted.


Northeast MN; northern WI; western MI Upper Peninsula: Locally severe thunderstorms tonight pose the risk of hail. I-35, US-2 potentially impacted.

— Southern MN; much of central and eastern SD; central and eastern NE; IA; southern and western WI; IL; central and eastern KS; MO; western KY and TN; central and eastern OK; AR; central and eastern TX; LA; MS; central AL: A combination of Excessive Heat Warnings, Watches and Advisories through Thursday. Head index values 105-120 deg F. Highest heat index values today and Tuesday will be over MO. This area covers the central US from Minnesota to the Gulf Coast, from the Midwest to the Plains.


— Central and southern IN; north-central and western KY; central GA: Excessive Heat Warnings (southern IN and KY), Watches (rest of IN) and Advisories through Thursday. Heat index values as high as 110 deg F.

MI Upper Peninsula and northern Lower Peninsula: Marginal risk for severe thunderstorms Tuesday night. Hail will be the primary hazard. I-75, I-196, US-2, US-31 potentially impacted.

Severe thunderstorm risk today and tonight.
Wildfire smoke concentrations late this afternoon and evening Monday 21 August
Severe thunderstorm risk tomorrow and tomorrow night.
Total rainfall amounts for the next three days

Current Severe Thunderstorm and Tornado Watches from the National Weather Service Storm Prediction Center

Tropical weather outlook from the National Hurricane Center

Tornado safety information for RVers (what to do!):

Access to real-time road information:

Phone numbers and websites for road conditions in all 50 states. Courtesy of the Cheyenne WY Weather Forecast Office

Some useful links:

High-resolution radar

Your local forecast

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